Anti-Hillary super PAC runs ad featuring Benghazi victim's gravestone

A super PAC opposing Hillary Clinton's presidential campaign has released a new video featuring the gravestone of former Ambassador Chris Stevens, one of four Americans killed in the 2012 Benghazi terrorist attacks.

Stop Hillary PAC tweeted the ad and indicated its intention to promote the video during the first Democratic presidential debate on CNN.

"Dear Hillary Clinton, I'd like to ask you why you ignored calls for help in Benghazi and then four Americans were murdered," a narrator can be heard saying while images of the four dead Americans appear on screen.

The ad is titled, "I'd like to ask," but closes with a narrator saying, "But Mrs. Clinton I can't. What difference does it make?" as Stevens' image appears followed by a picture of a gravestone bearing Stevens' name.